You were pretty close. The Swatara Branch (originally Mine Hill & Schuylkill Haven), was built c. 1845 from Swatara Jct. and ran up Swatara Creek to a colliery. Swatara post office and station were around where it crossed the road from Newtown to Branchdale (i.e., 209). Per Taber, abandoned from the colliery back to Swatara before 1955 and back to the Middle Creek branch junction between 1955 and 1960, although it looks like it may have been restored for coal stripping. The locale is now marked "Zerbe" on topo maps.